HIV Antigen Test Singapore | Shim Clinic

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HIV antigen test: HIV p24 antigen test tests for the HIV p24 antigen which is released very early after HIV infection.

The HIV p24 antigen appears in early infection, before the appearance of HIV antibodies. But later declines when the HIV antibodies begin to appear.

Very soon after HIV infection, the p24 antigen is produced. However it’s presence in the blood is rather transient, as it disappears quite soon, as the antibodies are produced.

The HIV antigen test is part of the 4th generation HIV ELISA test, which tests for both the HIV antigen as well as the HIV antibody. Testing for the HIV antigen allows the HIV window period to be brought down to 28 days after infection.

Sexual risk (of HIV/STD/pregnancy), and what you can do before and after exposure.

Timeline HIV STD Pregnancy
Before exposure
Abstain from sex, Be faithful, or Condom use
Circumcision (males only)
(females only)
HIV PrEP (pre-exposure prophylaxis)
– Stop HIV infection before exposure
STD vaccine:
Hepatitis vaccine
HPV vaccine
STD / HIV exposure
Unsafe sex / unprotected sex:
No condom / Condom broke / Condom slip
0-72 hours HIV PEP (post-exposure prophylaxis)
– Stop HIV infection after exposure
STD testing *
Screening test
– to look for asymptomatic infections
– from previous exposures
Emergency contraception
with the
morning-after pill
(females only)
2 weeks HIV DNA Test
1 month HIV 4th Generation Test
SD Bioline HIV Ag/Ab Combo
– Fingerprick blood sampling.
20 minutes to results
3 months HIV 3rd Generation Test
OraQuick® HIV-1/2 Antibody
– Oral fluid or
– Fingerprick blood sampling.
20 minutes to results
STD testing *
– Full & comprehensive
diagnostic test
– to look for current infections
Watch for HIV Symptoms STD Symptoms
If infected HIV Treatment STD Treatment Abortion

* Males: Do not urinate for at least 4 hours before arriving.
* Females: testing is more accurate when you are not menstruating.


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